I am doing ansys CFX analysis inside the human artery .There is a systole and diastole flow inside the artery. How to define the velocity profile as an inlet. I have to define the velocity profile as a sine function
u(t)= Uo( 1+sin (4*pi -Pi /2)
How to set this boundary condition . I dont know the procedure . I kindly request someone to help me to set the boundary condition step by step.

CFX employs the CEL language where you can define expressions. Under the expression tab create a new expression and define the velocity profile in the form you have with reference to global coordinates. Then under the boundary tab set the value of the boundary to the defined expression.

It looks like a 1D analysis so set the other to components of velocity to zero. What does the independent variable t mean in your formula?